Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 4223349 | System for rotating an information storage disc at a variable angular velocity to recover information therefrom at a prescribed constant rate Method and apparatus for recovering information at a substantially constant rate from a rotatable information storage disc. The information is stored on the disc in a plurality of substantially circular and concentrically arranged information tracks, with... | 09/16/1980 |
| 4223347 | Videodisc with undulating nested tracks A record carrier is described on which information is stored in an optically readable structure of trackwise arranged areas and intermediate areas. By giving the information tracks periodic excursions towards and away from adjacent tracks, in a direction ... | 09/16/1980 |
| 4223187 | Method and apparatus for recording and reproducing a video-disc with an oscillated track In order to record information spirally on a disk and to reproduce the recorded information accurately without any contact, at the recording, an information signal and a predetermined signal for synchronous detection are added together, the resultant sign... | 09/16/1980 |
| 4222072 | Video player/recorder with non-linear mark length modulation In a video disk system a mark along a record data track is modulated in length to represent multi-bit binary code blocks of a first length (such as three or fout bits) and the player system associated with the disk operates in multi-bit code blocks that a... | 09/09/1980 |
| 4213148 | Recording/playback apparatus using a single pilot tone for active tracking and control of a video disc pickup device In a video disc playback apparatus, an active tracking control system is provided using a single pilot signal. The pilot signal is recorded on an information track of a video disc record such that each convolution of the track contains a non-integral numb... | 07/15/1980 |
| 4210931 | Video player and/or recorder with Hadamard transform An apparatus for performing a Hadamard transform on video data for compression of data to be recorded and decompression of data read from a record for display achieves the necessary high rate by means of two or more adders and two subtractors operating in... | 07/01/1980 |
| 4205338 | Disc recording tracking system A prerecorded track on a disc is automatically tracked resulting in a radial tracking signal. Components of this signal are stored during a prerecording interval. During recording these stored components are used to produce a restored radial tracking sign... | 05/27/1980 |
| 4198658 | Recording/playback apparatus facilitating track skip detection A recording signal containing a main carrier modulated in accordance with picture signal information inclusive of synchronizing components, and an auxiliary carrier modulated in accordance with sound signal information and a pilot signal, is impressed on ... | 04/15/1980 |
| 4193098 | Segmented video playback apparatus with ancillary recording medium A system for playback of segmented video information on a tape employs an ancillary recording medium which is rotationally driven at a rotation rate of the primary segment scanning apparatus. Each segment of a video field is recorded in a respective track... | 03/11/1980 |
| 4164756 | Disc record groove skipper A signal pickup stylus which cooperates with an information storing spiral groove on a video disc record is caused to selectively skip groove convolutions of the disc record to produce special effects including stop, fast-forward and reverse motion of the... | 08/14/1979 |
| 4163262 | Helical video tape recorder arrangement suitable for high quality editing Disclosed is a helical scan video tape recorder having a flying sense head located upstream from a flying erase head and further upstream from a flying record/playback head. By employing a separate sense head to detect synch pulses, tension and relative s... | 07/31/1979 |
| 4161753 | Video recording disk with interlacing of data for frames on the same track A video recording disk is adapted to be rotated at a uniform angular velocity and to have bit positions of substantially equal length along a track, and the longer outer tracks are given more storage positions than the shorter inner tracks. Variable numbe... | 07/17/1979 |
| 4157572 | Superimposition of television images Apparatus for the superimposition of television images including recorder apparatus for recording and playing back first video signals, image generating apparatus for providing second video signals, drive apparatus for driving the image generating apparat... | 06/05/1979 |
| 4142209 | Disc track servo system Apparatus for optically recording and reading information on a disc medium rotating surface. The information is recorded on concentric or spiral tracks continuously or in parts. The information, which can represent, for example, television video, x-ray, o... | 02/27/1979 |
| 4124866 | Video disc insertion/extraction system for a video disc player A system for inserting and removing a video disc into and from a player without the need for removing the video disc from its protective cover during said insertion and removal is disclosed. The system includes a clamping device built into the player for ... | 11/07/1978 |
| 4123779 | Turntable rotational speed and phase control system for a video disc play/record apparatus Video disc play/record apparatus includes a turntable driven by a uni-directional DC motor, a speed loop for controlling motor rotation responsively to horizontal sync signal and a position loop for controlling the rotational phase of the turntable respon... | 10/31/1978 |
| 4064538 | Method and device for displaying a picture film via a video-disc A method and apparatus for displaying a picture film via a video-disc which consists in analyzing the pictures of the film on a plurality of interlaced fields which are successively recorded onto a video-disc. These fields are then read simultaneously on ... | 12/20/1977 |
| 4025958 | Jitter prevention system for video signal processing Video signals are transferred from a phonograph record or low speed magnetic tape and stored on a magnetic sheet disc rotating at low speed. The magnetic sheet disc is then rotated at high speed to output the video signals to a television display or the l... | 05/24/1977 |
| 4022968 | Recording apparatus and methods for use in forming a video disc record having spirally aligned sync storage locations Video disc record is provided with a spiral information track containing recorded representations of composite video signals. The information representations occupying the length of each convolution of the spiral depart slightly from an integral number of... | 05/10/1977 |
| 4018987 | Video disc playback apparatus Video disc record is provided with a spiral information track containing recorded representations of composite video signals. The information represents occupying the length of each convolution of the spiral depart slightly from an integral number of fiel... | 04/19/1977 |
| 4018984 | Video disc record having spirally aligned sync storage locations Video disc record is provided with a spiral information track containing recorded representations of composite video signals. The information representations occupying the length of each convolution of the spiral depart slightly from an integral number of... | 04/19/1977 |
| 4017678 | End-of-play control system Video disc player pickup circuit recovers picture information in the form of carrier waves, the instantaneous frequency of which varies over a given deviation range in accordance with the amplitude of composite color video signals, in the course of pickup... | 04/12/1977 |
| 4001882 | Magnetic tape editing, previewing and animating method and system In editing magnetic tape, in particular video tape, improvement in the editing taught by U.S. Pat. No. 3,787,617 is achieved by arresting the respective tapes on the edit tape deck and the source tape deck precisely at the "edit" point by observation on a... | 01/04/1977 |
| 3993863 | Disc record groove skipper A signal pickup stylus which cooperates with an information storing spiral groove on a video disc record is caused to selectively skip groove convolutions of the disc record to produce special effects including stop, fast-forward and reverse motion of the... | 11/23/1976 |
| 3976830 | Apparatus and method for embossing information on a disc The disclosure pertains to an apparatus for receiving electronic signals and embossing modulated grooves on a carrier medium as a function of the received signals, the apparatus including a support for supporting an embossing assembly and a carrier medium... | 08/24/1976 |
| 3973080 | Playback device for a disc-shaped record carrier with transducer lifting for changing playback groove for fast, slow or stop effects A playback device for disc-shaped record carriers containing video signals stored in the grooves thereof which includes an arrangement which, in response to an applied power pulse, displaces the pickup, during playback, by a number of groove widths transv... | 08/03/1976 |
| 3963860 | Locked groove detection and correction in video disc playback apparatus When a "locked groove" condition is encountered in the playback of a video disc having sync signal recording locations non-radially aligned in successive groove convolutions, each initiation of a repeat reading of the same groove convolution(s) results in... | 06/15/1976 |
| 3947625 | Electrically controlled radial mass shifting elements for turntable speed regulation in an apparatus for reading disc-shaped information carriers An apparatus for reading disc-shaped information carriers which are provided with substantially circular tracks, in which information is stored in coded form, in particular picture information, which information carriers are disposed on a turntable, a rea... | 03/30/1976 |
